Antonio Menezes Leitao (my apologies for losing the accents in translation) has received mention in several other CL blogs thanks too some wonderful papers that showed up on the ALU website. Mentioning him here is probably a bit too incestuous but his Increasing Readability and Efficiency in Common Lisp is a masterful exposition of what you can do with compiler macros. His work shows just how impoverished my deprecate is!